Apollo AAN-1 User manual

This manual contains confidential information and
may only be reproduced or distributed with the
written consent of Apollo Security Sales, Inc.
© 2011 Apollo Security Inc.
AAN-1 & AAN-2
Hardware Manual
Revision Date: 19 OCT 2011

AAN-1 & AAN-2 Hardware Manual
by Apollo Security Inc.
All rights reserved. No parts of this work may be reproduced in any form or by any means - graphic, electronic, or
mechanical, including photocopying, recording, taping, or information storage and retrieval systems - without the
written permission of Apollo Security, Inc.
While every precaution has been taken in the preparation of this document, Apollo Security assumes no responsibility
for errors or omissions, or for damages resulting from the use of information contained in this document or from the
use of programs and source code that may accompany it. In no event shall the publisher and the author be liable for
any loss of profit or any other commercial damage caused or alleged to have been caused directly or indirectly by this
document.
© 2011 Apollo Security Inc.
Advanced Electronic Controller For Apollo Access Control Systems

W A R N I N G
HIGH VOLTAGE, AC MAIN POWER SHOULD ONLY BE CONNECTED BY QUALIFIED,
LICENSED ELECTRICIANS. ALL APPLICABLE LAWS AND CODES MUST BE FOLLOWED. IF
THIS PRECAUTION IS NOT OBSERVED, PERSONAL INJURY OR DEATH COULD OCCUR
Power should not be applied to the system until after the installation has been completed. If this
precaution is not observed, personal injury or death could occur, and the equipment could be
damaged beyond repair.
-Verify that the external circuit breaker which supplies power to the device power supply is turned
off prior to installation.
-Verify that the output voltage of the power supply is within specifications prior to connection to the
device.
C A U T I O N
Several important procedures should be followed to prevent electro-static discharge (ESD) damage
to sensitive CMOS integrated circuits and modules.
-All transport of electronic components, including completed reader assemblies, should be in static
shield packaging and containers.
-Handle all ESD sensitive components at an approved static controlled work station. These work
stations consist of a desk mat, floor mat and a ESD wrist strap. Work stations are available from
various vendors including the 3M company.
FCC Compliance Statement
This device complies with Part 15 of FCC Rules. Operation is subject to the following two
conditions:
1.This device may not cause harmful interference, and
2.This device must accept any interference received, including interference that may cause
undesired operation.
This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. This
equipment generates, uses, and can radiate radio frequency energy and, if not installed and used
in accordance with the instruction manual, may cause harmful interference to radio
communications. Operation of this device in a residential area is likely to cause harmful
interference in which case the user will be required to correct the interference at his/her own
expense. The user is advised that any equipment changes or modifications not expressly approved
by the party responsible for compliance would void the compliance to FCC regulations and
therefore, the user's authority to operate the equipment.
IMPORTANT INFORMATION

AAN-1 & AAN-2 Hardware ManualI
© 2011 Apollo Security Inc.
Table of Contents
Part I Introduction 2
...................................................................................................................................21Overview
...................................................................................................................................22 General Features
...................................................................................................................................33Modes Of Operation
...................................................................................................................................44Programming Host
Part II Hardware Layout 6
...................................................................................................................................71Terminal Connectors
...................................................................................................................................82DIP Switches
......................................................................................................................................................... 9DIP Switch Tables
......................................................................................................................................................... 10DIP Switch Function
...................................................................................................................................103Connectors
......................................................................................................................................................... 11Device Port Communication Driver Socket
......................................................................................................................................................... 11Additional Connectors
...................................................................................................................................114 LEDs
......................................................................................................................................................... 11Start Up Mode
......................................................................................................................................................... 12Normal Operation
...................................................................................................................................125Firmware
...................................................................................................................................126Memory Backup
...................................................................................................................................137 Additional Installation Information
......................................................................................................................................................... 13Mounting Holes
Part III System Wiring 15
...................................................................................................................................151Power
...................................................................................................................................152Grounding
......................................................................................................................................................... 15DC Ground
......................................................................................................................................................... 15RS-485 Signal Ground (SG)
......................................................................................................................................................... 16Safety (Earth) Ground
......................................................................................................................................................... 16Grounding System
......................................................................................................................................................... 16Grounding Potential Difference Checks Before Connecting
...................................................................................................................................173Host Communication Connection
......................................................................................................................................................... 17Serial ......................................................................................................................................................... 18Network .................................................................................................................................................. 19ENI-100 ........................................................................................................................................... 19Introduction
........................................................................................................................................... 19Hardware Layout
...................................................................................................................................... 19Connectors
...................................................................................................................................... 19TTL Serial Connector
...................................................................................................................................... 19RJ-45 Jack
........................................................................................................................................... 20Communication Configuration
...................................................................................................................................234 Card Reader Wiring

IIContents
© 2011 Apollo Security Inc.
...................................................................................................................................255Reader Input Wiring
......................................................................................................................................................... 25Input Supervision (Overview)
......................................................................................................................................................... 26Door Contact Input (Door Position Switch)
......................................................................................................................................................... 27Exit Pushbutton Input (Request To Exit, REX)
......................................................................................................................................................... 27Auxiliary Alarm Inputs
...................................................................................................................................276Output Relay Wiring
......................................................................................................................................................... 28Strike Wiring, General
......................................................................................................................................................... 28Strike Suppression Installation
......................................................................................................................................................... 29Strike Wiring, Internal Relay
......................................................................................................................................................... 32ADA External High Security Relays
.................................................................................................................................................. 33Strike Wiring, External ADA-10/11, High Security Relay
.................................................................................................................................................. 34Additional Output Relay Wiring
.................................................................................................................................................. 34ADA DIP Switches/Jumpers
...................................................................................................................................377General Alarm Inputs
......................................................................................................................................................... 37Cabinet Tamper
Part IV Software Configuration Utilities 39
...................................................................................................................................391ENI-100 IP Programming
......................................................................................................................................................... 39InitAAN ......................................................................................................................................................... 42Web Page
......................................................................................................................................................... 45Telnet
Part V Troubleshooting 49
...................................................................................................................................491Communications
...................................................................................................................................502Reader / Keypad
...................................................................................................................................503Input Zones
...................................................................................................................................504 Output relays
Part VI Specifications 52
Part VII Supplemental Figures 54
Part VIII Table of Figures 61
Part IX Revision History 63
Index 64

Part
Introduction
I

2Introduction
© 2011 Apollo Security Inc.
1Introduction
An access control system provides a means to replace traditional key and lock systems, which are easy to
defeat because of the ease of copying of keys and use by unauthorized personnel. With electronic access
control, the exact areas a person is able to access as well as during what time is configurable through a
central control system. In addition to the power of greater control, a historical record is maintained which is
useful in the case of a system security breach or for other purposes including calculating work time and
facility use costing.
1.1 Overview
The AAN-1 and AAN-2 Access and Alarm Network Controllers are a self-contained controllers for two card
readers and door hardware as well as additional alarm inputs and outputs. Typical use of the is the control of
site access by control of door locking devices associated with card readers and PIN keypads and
maintaining logs of this access for later reporting.
The AAN-1/2 works through connection to a host programming device (PC computer with a database
interface application), which defines configuration for the two built-in reader interfaces. The connections
between the AAN-1/2 and host can be made via Ethernet TCP/IP (AAN-1/2N) or RS-232 or RS-485 serial
connection (AAN-1/2S).
By supporting both centralized and distributed database operation, once the AAN-1/2 controller has been
programmed from the host device, it will work independently and only require connection to the host for live
event monitoring and reporting of events to the database. All the necessary information to carry out access
decisions and other response functions of the system is stored within the AAN-1/2's internal memory and
does not rely on a constant connection to the host computer.
The AAN-1/2 provides interface connections for a variety of card reader technologies, including proximity,
biometric, bar code, and infrared readers. Any card reader with standard Wiegand or mag stripe output can
be connected to the AAN-1/2. The AAN-1/2 communicates with host software to obtain configuration and
report system events. A downloadable card database of up to 20,000 cardholders and storage of up to 7000
events allows the AAN-1/2 to work independently after initial programming.
The AAN-1 supports two readers that control the single onboard door strike relay. A successful access grant
on either reader will open the strike relay--this is known as 'Paired Mode'. Exit push button, door contact and
two auxiliary inputs are provided.
The AAN-2 supports two readers that can be configured to control the two onboard relays in either paired
mode (using both readers to control a single strike relay) or in unpaired mode (where each reader will control
a separate strike relay). Exit push buttons, door contacts are available for two doors. When operating in
paired mode, the unused door inputs are available for auxiliary use.
See the Modes of Operation topic for more information on paired and unpaired mode.
1.2 General Features
·Supports 2 readers, keypads or reader/keypad combinations for 1 or 2 (AAN-2 only) door control
·Full Stand Alone Operation with Local database of 20,000 cards or 7,000 events
·Multiple Card Formats
·Up to 8 Facility Codes
·2Relay Outputs
·Control of up to 4 ADA-10/11 High Security Relay Output Modules
·RS-485 or RS-232
·Field-Replaceable plug-in communication drivers
·Flash Memory for easy firmware upgrades
·Real Time Clock
·Surface-mount manufacturing technology

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1.3 Modes Of Operation
CONFIGURATION / INITIAL MODE
To establish operating configuration, the AAN-1/2 interface requires connection to a host programming
device which contains a software database interface program. Configuration options including cardholders
are stored in a central database and then transmitted via a proprietary encrypted protocol to the AAN-1/2
controller. The AAN-1/2 controller will communicate with the host to download the following configuration
information:
·Card Reader Data Output Format: Wiegand or Mag Stripe
·Strike Time—The time duration that the strike relay will be energized for in the case of an access grant
·Held Open Time—After an access grant and a subsequent opening of the door contact, the time in which
the door contact must be closed before an alarm state is reported
·Initial Reader Mode—The access mode in which the reader will function upon powering up or when
communication has been interrupted between the AAN-1/2 and host. The following modes are supported:
oCard Only—An access request is made by presenting a card to the reader. The data is verified against
the AAN-1/2 database to ensure that the card has a valid Facility Code and Card Number.
oCard or PIN—Access requests are made either by presenting a card or by keying in a PIN (Personal
Identification Number) on a keypad. A card entry is process as in Card Only access mode.
oCard & PIN—A card must be read to start the access request. If the card is valid, the user is prompted
to enter the corresponding PIN. The request is granted only if the card and PIN match.
oLocked—No access granted. Reader ignores all cards and PIN entries.
oUnlocked—Door strike is continuously energized and the door contact input is not monitored. Access is
not controlled.
oFacility Code—The entire card contents are read by the AAN-1/2, but only the Facility Code is checked,
and if it matches a Facility Code downloaded from the programming host, access is granted.
PAIRED / UNPAIRED MODE (1 or 2 Door Control)
The AAN-1 always works in paired mode. A successful card read on either reader will energize the single
onboard strike relay.
The AAN-2 can be configured via software to operate in either paired or unpaired reader mode. In the first
case (the default mode), both readers of the AAN-2 will control one door strike relay. In this case, the second
onboard relay serves as a local alarm relay and auxiliary inputs will be available. If unpaired reader mode is
selected, each reader will control a separate strike relay, thus two doors can be controlled. The inputs that
are auxiliary in paired mode are used for exit push button and door contact for the second reader in this
mode.

4Introduction
© 2011 Apollo Security Inc.
1.4 Programming Host
To establish operating configuration and to report events, the AAN-1/2 controller requires connection to a
software database interface program. Configuration options including cardholders are stored in a central
database and then transmitted via a proprietary encrypted protocol to the AAN-1/2. Once programmed, the
AAN-1/2 will continue to function without connection to the host. A record of all actions that happen while
there is no connection is stored in the memory of the AAN (limited by the capacity of the memory) for
reporting at a later time when connection with the host has been re-established.
Apollo has designed the APACS software system to provide the closest integration possible to take full
advantage of the features of the AAN-1/2 controller. Full documentation on configuring the options of the
AAN-1/2 with APACS is contained in the documentation provided with the software.
Figure 1.3 Programming Host Logical Diagram. Typical System Layout with RS-485 Connections.
Several AAN-1/2 panels can be connected to one host on an RS-485 line using different device addresses.
Field devices on the same line must also have unique addresses.

Part
Hardware Layout
II

6Hardware Layout
© 2011 Apollo Security Inc.
2 Hardware Layout
Figure 2.1 AAN-1/2 Diagram. Terminal connectors, DIP switch, output relays, device port driver
connection, and other component locations are shown.

7AAN-1 & AAN-2 Hardware Manual
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2.1 Terminal Connectors
The AAN-1/2 has three terminal blocks for connecting power, reader and alarm inputs, and relay output
connections. The AAN-2 is equipped with a fourth terminal block for an additional relay. The connection
terminals are factory equipped with removable screw-down quick connectors which are easily removed from
the board by firmly grasping the connector and pulling away from the board. If pliers are used to remove the
connectors, they should be of the rubber-tipped type. Take care in using any tools near the board not to
damage onboard components. The proper location of the quick connectors is outlined in white on the board.
AAN-1/2 Terminal Connections
Position
Type
Label
Function
TB1-1
Tamper Input
TMPR
Cabinet Tamper Input
TB1-2
Tamper Input Return
GND
TB6-1
Door Contact Input
DC
Door Contact Input (Reader 1)
TB6-2
Door Contact Input
Return
DCR
TB6-3
Exit Push Button
EPB
Exit Push Button (Reader 1)
TB6-4
Exit Push Button Return
EPBR
TB6-5
Aux Input 1
AUX1
PAIRED MODE
UNPAIRED MODE
(AAN-2 only)
TB6-6
Aux Input 1 Return
AUX1R
Auxiliary Input 1
(Normally Closed)
Door Contact Input
(Reader 2)
(Normally Closed)
TB6-7
Aux Input 2
AUX2
Auxiliary Input 2
(Normally Closed)
Exit Push Button
(Reader 2)
(Normally Open)
TB6-8
Aux Input 2 Return
AUX2R
TB4-1
Yellow LED Control
YLED
Reader 1 Device Connections
TB4-2
Red LED Control
RLED
TB4-3
DC Reader Power
Output
VDC
TB4-4
Wiegand Data 0
DATA0
TB4-5
Wiegand Data 1
DATA1
TB4-6
Buzzer Control
BZR
TB4-7
Green LED Control
GLED
TB4-8
DC Reader Power
Ground
GND
TB3-5
Signal Ground
SG
Serial Communication Connection
TB3-4
Receive Data (-)
RX-
TB3-3
Receive Data (+)
RX+
TB3-2
Transmit Data (-)
TX-
TB3-1
Transmit Data (+)
TX+

8Hardware Layout
© 2011 Apollo Security Inc.
AAN-1/2 Terminal Connections
TB7-4
Diode
DIODE
Internal Suppression Diode Connection
Strike Relay 1
TB7-3
Normally Open
NO
Door 1 Strike Relay Connection
TB7-2
Normally Closed
NC
TB7-1
Common
COM
TB2-2
20mA Loop Signal Out
DSOUT
ADA 10/11 External Relay Loop
TB2-1
20mA Loop Signal
Return
DSRET
TB5-8
DC Reader Power
Ground
GND
Reader 2 Device Connections
TB5-7
Green LED Control
GLED
TB5-6
Buzzer Control
BZR
TB5-5
Wiegand Data 1
DATA1
TB5-4
Wiegand Data 0
DATA0
TB5-3
DC Reader Power
Output
VDC
TB5-2
Red LED Control
RLED
TB5-1
Yellow LED Control
YLED
TB9-1
Normally Open
NO (AAN-2 only)
PAIRED MODE
UNPAIRED MODE
(AAN-2 only)
TB9-2
Normally Closed
NC (AAN-2 only)
LOCAL ALARM
Relay Connection
(not AUX! - see
Additional Output
Relay Wiring topic)
Door 2 Strike Relay
Connection
TB9-3
Common
COM (AAN-2 only)
TB9-4
Diode
DIODE (AAN-2 only)
Internal Suppression Diode Connection
Strike Relay 2
TB8-1
Power Input
VIN
Power Input Connection
TB8-2
Ground
GND
Table 2.1: AAN-1/2 Terminal Connections.
2.2 DIP Switches
The AAN-1/2 has one block of DIP switches, with 8 switches. These switches are used to set various
configuration options for the interface. It is recommended to power the board down before making any
changes in the DIP switch settings as any changes will not take effect unless the power is cycled.

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2.2.1 DIP Switch Tables
Communications Address (SW1)
4
5
6
7
8
OFF
OFF
OFF
OFF
OFF
0
OFF
OFF
OFF
OFF
ON
1
OFF
OFF
OFF
ON
OFF
2
OFF
OFF
OFF
ON
ON
3
OFF
OFF
ON
OFF
OFF
4
OFF
OFF
ON
OFF
ON
5
OFF
OFF
ON
ON
OFF
6
OFF
OFF
ON
ON
ON
7
OFF
ON
OFF
OFF
OFF
8
OFF
ON
OFF
OFF
ON
9
OFF
ON
OFF
ON
OFF
10
OFF
ON
OFF
ON
ON
11
OFF
ON
ON
OFF
OFF
12
OFF
ON
ON
OFF
ON
13
OFF
ON
ON
ON
OFF
14
OFF
ON
ON
ON
ON
15
ON
OFF
OFF
OFF
OFF
16
ON
OFF
OFF
OFF
ON
17
ON
OFF
OFF
ON
OFF
18
ON
OFF
OFF
ON
ON
19
ON
OFF
ON
OFF
OFF
20
ON
OFF
ON
OFF
ON
21
ON
OFF
ON
ON
OFF
22
ON
OFF
ON
ON
ON
23
ON
ON
OFF
OFF
OFF
24
ON
ON
OFF
OFF
ON
25
ON
ON
OFF
ON
OFF
26
ON
ON
OFF
ON
ON
27
ON
ON
ON
OFF
OFF
28
ON
ON
ON
OFF
ON
29
ON
ON
ON
ON
OFF
30
ON
ON
ON
ON
ON
31
Baud Rate
2
3
1200
OFF
OFF
2400
OFF
ON
4800
ON
OFF
9600
ON
ON
Input Monitor Mode
1
Unsupervised
OFF
Supervised
ON
Table 2.2: AAN-1/2 DIP Switch Settings

10Hardware Layout
© 2011 Apollo Security Inc.
2.2.2 DIP Switch Function
Communications Address——This option sets the address that identifies the device on the
communications line. This setting must be specified in the host software in able to identify the device. A
maximum of 16 AAN-1/2 devices can be installed on one communication line (RS-485), with each having
aunique address (between 0-31). The communications address must also be specified in the host
software when the AAN-1/2 is connected though a network. NOTE: AAN-1/2 controllers can NOT be
used on the same serial communications line as an AAN-100 or AAN-32 controller.
Baud Rate—Specifies the baud rate for the serial line of interface. This setting must be the same for all
devices on the communication line connected to this port.
Input Monitor Mode—Specifies whether all inputs on the interface (Auxiliary inputs, door contacts, exit
push buttons) will be monitored by comparing the resistance value of the input line with the expected value.
ON—In the event of tampering with the input, the interface will report the specific type of error.
OFF—Inputs will operate in standard mode.
Table 2.2.1 :DIP Switch Function
2.3 Connectors
The AAN-1/2 has several connectors for interfacing with removable components. Take care when installing
and removing components in order not to damage pins or sockets. Do not use force greater than gentle
pressure when installing any components. Refer to the figure for the exact location of these connectors. The
connectors are also labeled on the AAN-1/2 in white lettering on the circuit board.

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2.3.1 Device Port Communication Driver Socket
Port Communication Driver Socket: J4
For communication on the AAN-1/2, a communication module must be connected to the 12-pin socket. The
required module depends on the type of host connection:
Network Communication (AAN-1/2N) - In order to use network (TCP/IP) connection to the
software host, the AAN-1/2 should be equipped with an ENI-100 Network Interface device. This
allows connection to the network via the ENI's RJ-45 jack and a standard UTP Ethernet cable (the
RS-485 Host Communication Connection terminals are not used in this mode) . In this case, the
software host will need two pieces of information to communicate with the hardware: the IP address
of the ENI-100 Network Interface (Set by the ENI-100's internal webpage configuration) and the
Communication Address (set by DIP switches). The software will first search for the IP address and
then will use the Communication Address to find the specified device at that address. In this case
there is only one device connected, but it is nonetheless important that the Communication Address
is the same in the software as is set on the DIP switches.
Serial Communication (AAN-1/2S) - To use the AAN-1/2 in serial communication mode, a serial
driver must be connected to the driver socket. The communication driver module can be either
ASM-48 (RS-485, part number 430-131) or ASM-23 (RS-232, part number 430-132) depending on
the type of communication required on the port. The device is connected to the serial
communications line using the Host Communication Connection (see Table 2.1). If RS-232 is used,
one device may be connected to the line. If RS-485 is used, a maximum of 16 AAN-1/2s can be
connected on one communications line (each having a unique address from 0 to 31). NOTE:
AAN-1/2 controllers can NOT be used on the same serial communications line as an AAN-100
or AAN-32 controller.
Module Installation - The desired module should be installed so the long end extends towards the middle of
the board and the mounting holes provided on the AAN-1/2 and ASM or ENI align so a plastic stand-off and
screws can be attached to connect the holes. METAL SCREWS AND STANDOFFS SHOULD NOT BE
USED TO MOUNT THE ASM/ENI.
2.3.2 Additional Connectors
Additional Connectors/Jumpers: J2, J3
These connectors and jumpers are used for factory configuration and should not be modified or connected in
any way unless directed by your technical support.
2.4 LEDs
The AAN-1/2 has 2 LEDs for use in monitoring functioning of panel and for diagnosis of problems. The LEDs
function in two modes: startup and normal operation
2.4.1 Start Up Mode
Immediately after powering on the panel, the start-up test will initiate and the results will be displayed on the
LEDs. If there are no failures, the test will progress. If the panel encounters an error, it will stop with the failed
test and display the LED sequence corresponding to that test. The test sequence and the LED codes are:
Test
D4
D5
ROM/Firmware
ON
OFF
RAM
OFF
ON
Test OK—Loading Config
ON
ON
Table 2. 4: AAN-1/2 Start up LED Function

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© 2011 Apollo Security Inc.
2.4.2 Normal Operation
After initialization and self tests, the LEDs will switch to normal operation and will display information about
the panel operation.
Heartbeat (D4)—Shows a constant ‘heartbeat’ (0.2 sec ON, 0.8 sec OFF) to indicate proper operation of the
panel and firmware.
Port Status (D5)—Shows activity on the serial port. Normal activity on the ports will be observed as the LED
blinks many times a second or lighted solid, depending on the amount of activity.
2.5 Firmware
The operating program for the AAN-1/2 is stored in re-programmable flash memory. In the event that the
firmware must be re-installed or updated, no chips need to be replaced on the panel. The new program can
be loaded from the host via special software. For normal operation it is not necessary to update the firmware.
If this becomes necessary, contact your Apollo Support Representative. Firmware updating should only be
done under the recommendation and guidance of your Apollo technical support representative.
2.6 Memory Backup
The AAN-1/2 is equipped with onboard memory to store configuration information and event data. This
memory, as well as the real-time clock, is provided with back-up power (for up to 5 days) in the event of
primary power failure. Power is supplied by a special capacitor-based circuit. Battery replacement is never
required.
If clearing of the system memory is necessary, the capacitor circuit can be 'drained' thus removing power
from the configuration memory so a completely new configuration can be loaded. See the troubleshooting
section for more information.

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2.7 Additional Installation Information
2.7.1 Mounting Holes
Four holes are provided for mounting the AAN-1/2. Standoffs should be used when mounting in order to
protect the underside of the circuit board.
Figure 2.7.1 AAN-1/2 Mounting Holes. Location of mounting holes for the AAN-1/2 is shown in
scale. Note that the drawing will not print the exact size of the actual circuit board.

Part
System Wiring
III

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3System Wiring
SPECIAL NOTE: To guard personal safety and avoid damaging
equipment it is important to have a full understanding of electrical
wiring practices and safety. The following sections provide general
guidelines relating to the AAN-1/2, but are not a substitute for complete
training in dealing with electrical systems!
3.1 Power
Power Connection: TB8
Power is supplied to the AAN-1/2 by the voltage connection in terminal block 8 (see Part 2.1 for exact
locations of terminals). The power connection should be 12-24 VDC. Power consumption is 250 mA. The
AAN-1/2 is protected from over-current and over-voltage by onboard circuitry.
Take care when selecting a power supply for use with the AAN-1/2. Most power supplies in the market today
provide good input/output isolation, however those which do not provide isolation (or have high leakage
capacitance), coupled with accidental AC power lines interchange, present serious ground fault problems for
installers. With ground fault, the signal reference between subsystems may be 115 VAc (230 VAc) apart. If
these subsystems are interconnected, the large potential difference will cause equipment damage or
personal injury. Apollo recommends the use of isolated continuous power supplies only. All Apollo supplied
power supply assemblies are transformer isolated for safety and to minimize ground loop problems.
In the case of over-current, solid-state fuses integrated on the AAN-1/2 panel will ‘trip’ to protect the
components of the panel. In many cases, the solid-state fuses will reset automatically when normal current
resumes, however it may be necessary to interrupt the supply of power to allow the fuses to reset.
3.2 Grounding
Special care should be taken when grounding the AAN-1/2 controller and other devices connected to it via
the direct communication lines. Each device must be grounded to provide ESD protection, personnel safety,
and signal reference for devices which communicate with each other. Grounding the reader provides a good
shield against external transients. There are three types of circuit grounds in systems using Apollo products:
DC ground, RS-485 signal ground, and Safety (Earth) ground.
3.2.1 DC Ground
This is typically the minus (-) side of the DC output of the power supply. It is to be connected to the DC
ground input of all devices being powered by one supply. It must not be connected in any way to any of the 5
RS-485 signals or the AC side of the line including Safety (Earth) ground (one connection to Safety (Earth)
ground is acceptable, but this connection is usually internal in the host computer and should not be
introduced externally if direct connection is used (RS-232/485)).
3.2.2 RS-485 Signal Ground (SG)
This is the 5th wire used for the RS-485 communications. It is used to provide a common reference between
all devices on the line and should only be connected to each of the devices' SG input. The SG wire must not
be allowed to touch any other potential, especially earth ground. The shield drain wire of the RS-485
communications cable is commonly used to connect the SG leads together. Usually this wire does not have
an electrical insulator. It is important that the SG wire is thoroughly insulated by the installer at all connection
points. Improper insulation of this conductor may allow accidental shorting to earth ground through conduit or
other metallic components, causing intermittent communications or equipment damage.